Yeah, but you are fighting with the hypothetical, because in this hypothetical the BTC price is already $80k and a newbie is coming to BTC and he is having to decide what to do at that time. He cannot go back in history.
Another thing, is your presumption that BTC will dip merely because it gets to $80k. That has not always been the case in BTC history, but still we cannot necessarily merely use BTC price history in order to make our decision about what to do. We have to decide right at that time what to do, and we are new to bitcoin, we do not have any and we have to decide.
If you decide to wait for the dip, then you still don't have any BTC if the price does not end up dipping as you are suggesting that you expect it to do so.
I believe that eventually investment in Bitcoin will potentially yield significant returns, no matter at what price you buy it. However, the decision to invest in Bitcoin when prices are higher or wait for the potential dip is a personnel one. It completely depends on individual's financial situation, risk tolerance level and ability to continue holding it until the bull season demands patonce. This aspect might play a crucial role in success of investment.
You are not wrong but it is not a wise investment. Let's say you buy bitcoin for $69k, then you need to wait at least 4 years (based on history) for another bull season to come and you will start making profits, but the gains will be negligible. But if you study hard, research and analyze before investing, you will have the opportunity to buy bitcoin for $ 20k or $ 30k, when the bull season comes you will get a much larger profit.
And to do that, it depends not only on your financial situation but largely on your knowledge of the market. If you study hard, you will have enough knowledge, you will know when is the best time to buy and hold, and you will calculate the risks you will face...
I also believe that the price of bitcoin will continue to increase very strongly in the future. However, we need to invest with a strategy and plan to get the most optimal return, do not invest blindly.
